Like Anitmullet said, parts for Yokomo are far cheaper than Xrays, this is what made me decide to get a YZ-4 instead of the XB4. I loved the YZ-4 so much, as soon as the YZ-2 DT came out, I ordered it and it is by far the best buggy I have driven, and has been quite durable. I now have 4 weekends of racing on it and only popped a ball cup after hitting a pipe quite hard. looked over the car and no other damage. I am really impressed with this car. Im sure the XB2 is a good buggy, but I can say you wont be disappointed with the Yoke.